Steps to Debug and Fix the Template Not Found Issue

1. Check Template Directory Configuration: Ensure that your template directories are correctly configured in your settings. Open your settings.py file and verify that the TEMPLATES setting is properly set up. It should look something like this:

   TEMPLATES = [
       {
           'BACKEND': 'django.template.backends.django.DjangoTemplates',
           'DIRS': [os.path.join(BASE_DIR, 'templates')],
           'APP_DIRS': True,
           'OPTIONS': {
               'context_processors': [
                   'django.template.context_processors.debug',
                   'django.template.context_processors.request',
                   ...
               ],
           },
       },
   ]
   

   Make sure that you have a folder named templates in your project's BASE_DIR, and inside it, you should place your base.html file.
2. Check the Location of base.html:
   • Ensure that base.html is located in a directory that Django recognizes. For example:

     <project_root>/
     ├── templates/
     │   ├── base.html
     ├── myapp/
     ├── manage.py
     └── ...
     

3. Verify the File Name:
   • Check the spelling of base.html. Make sure there are no typos and that the file extension is correct.
4. Check App Template Folders:
   • If you are using Django apps, you may have a templates folder inside your app. In that case, base.html should be located as follows:

     <app_name>/
     ├── templates/
     │   ├── <app_name>/
     │   │   ├── base.html
     ├── models.py
     ├── views.py
     └── ...
     

5. Clear Cache (if applicable):
   • Sometimes, old template cache might interfere with rendering. You could clear any cache if you are using a caching backend, but this is typically less common with template rendering issues.
6. Run the Django Development Server Again:
   • Ensure you save all changes you made before running the Django development server again with:

     python manage.py runserver